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采用田间小区试验,研究了不施肥(CK)、化肥(NPK)、鸡粪(M)和分别基于鸡粪、猪粪制造的有机无机复混肥(NPKM1、NPKM2)5种施肥处理土壤水溶性有机碳(WSOC)的含量及其随小麦生育期的动态变化特征。结果表明,表层(0～20 cm)不同施肥处理的冷、热两种水溶性有机碳随生育期推移呈先增后减,随后再增加的动态变化;它们的含量在NPKM1、NPKM2处理下均显著高于CK和NPK处理(P<0.05),而低于M处理。各处理心土层(20～40cm)水溶性有机碳的动态变化趋势则表现出先增加后减少的变化趋势,而处理间水溶性有机碳含量高低顺序与表层相似。此外,表层两种水溶性有机碳与土壤养分、小麦产量的相关性比总有机碳高,因而能更灵敏地反映土壤养分供应状况和生产能力。
Field experiments were conducted to study the effects of five fertilizers, CK and NPK, chicken manure (M) and organic-inorganic fertilizer (NPKM1 and NPKM2) Content of Organic Carbon (WSOC) and Its Dynamic Variation with Growth Period of Wheat. The results showed that the contents of cold and hot water-soluble organic carbon in the top layer (0-20 cm) increased first and then decreased with the growth period, and then increased again. The contents of NPKM1 and NPKM2 Significantly higher than CK and NPK treatment (P <0.05), but lower than the M treatment. The dynamic trend of water-soluble organic carbon in the topsoil (20-40 cm) of soil in all treatments showed the trend of first increase and then decrease, while the order of water-soluble organic carbon in the treatments was similar to the surface layer. In addition, the correlation between surface water-soluble organic carbon and soil nutrient and wheat yield is higher than that of total organic carbon, which can more sensitively reflect soil nutrient supply and production capacity.